Lizzy Pattinson has so far kept her famous sibling a secret from The X Factor judges (Picture: Lizzy Pattinson/Twitter)

Robert Pattinson’s elder sister Lizzy Pattinson is through to The X Factor’s live auditions after impressing Simon, Cheryl, Mel B and Louis Walsh with her ‘husky, soulful vocals’ during her first audition.

Lizzy, 31, will sing in front of an audience at Wembley Stadium this weekend and is believed to be a surefire hit with the public.

‘She blew them away with her husky, soulful vocals,’ said a source. ‘She’s different to usual X Factor contestants – she really stands out. She could go all the way.’

We’re hoping Robert Pattinson turns up to the Wembley auditions in London this weekend (Picture: AP)

So far Lizzy’s kept her relationship to 28-year-old R-Patz under wraps but with the Twilight star due to be in the UK next week, could he put in a cheeky X Factor appearance?

‘She didn’t mention she was related to him to any judges or producers. It’s important to her she does not fall into the trap of just becoming ‘Rob’s sister’,’ the insider added to The Mirror.

Lizzy allegedly performed backing vocals for the Twilight soundtrack and scored a top 20 hit with club track Let The Sunshine In in 2003. You can watch the video here: